This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...vided no organized protection against force, it would compel every citizen to go about armed, to turn his home into a fortress, to shoot any strangers approaching his door — or to join a prote
ctive gang of citizens who would fight other gangs, formed for the same purpose, and thus bring about the degeneration of that society into the chaos of gang-rule, i.e., rule by brute force, int
o perpetual tribal warfare of prehistorical savages.
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The use of physical force — even its retaliatory use — cannot be left at the discretion of individual citizens. Peaceful co...